Novak Djokovic has lost his world number one ranking after suffering a shock defeat to world number 123, Czech Jiri Vesely, in his quarter-final in Dubai on Thursday. Playing in his first tournament since being deported from Australia, Djokovic needed to get as far as the semi-finals to retain his top ranking, but went down 6-4, 7-6 (7/4) to Vesely, who interestingly also beat the Serbian in their last meeting in 2016, Fox Sports reported. Djokovic had sat at the top of the rankings for 361 weeks until the defeat, with Russian Daniil Medvedev now replacing him. The Serbian had said at the start of the tournament that he “would be the first to congratulate” Medvedev, should he reach number one. This is the first time since 2004 that the world number one has not been part of what is known as the “Big Four”—Djokovic, Rafael Nadal, Roger Federer, and Andy Murray. …